Choosing between the TOTO Washlet S5 and the TOTO Washlet S7A is one of the most common dilemmas you’ll face when shopping for a premium bidet seat.
Both belong to TOTO’s latest lineup, but they serve very different buyers — so let’s break down exactly which one is right for you.
| Feature | TOTO Washlet S5 | TOTO Washlet S7A |
|---|---|---|
| Image |  |
 |
| Dimensions (L x W x H) | 21″ x 15-1/16″ x 5.5″ | 21″ x 15-1/16″ x 4.1″ |
| Water Heating | Instantaneous (endless) | Instantaneous (endless) |
| Auto Open/Close Lid | No | Yes |
| EWATER+ Bowl Cleaning | Wand only | Wand + bowl |
| Spray Settings | 5 adjustable settings | 5 adjustable settings |
| User Memory Presets | 4 user presets | 4 user presets |
| Warranty | 1-year limited | 2-year limited |
| Buy Now |  |
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1. TOTO Washlet S5 Electronic Bidet Toilet Seat (SW3446#01)
The TOTO Washlet S5 is TOTO’s direct successor to the beloved C5, arriving with meaningful upgrades that make it a strong contender in the mid-to-upper tier of bidet seats.
It features instantaneous water heating for truly endless warm water, a slimmer profile, and a redesigned remote with four user memory presets — everything the C5 offered, but better.
Features
- Instantaneous water heating for continuous warm water
- PREMIST bowl-misting before each use
- EWATER+ self-cleaning wand technology
- 5 adjustable spray settings including oscillating and pulsating
- Heated SoftClose seat with 5 temperature settings
- Warm air dryer with 5 temperature settings
- Automatic air deodorizer
- Built-in nightlight
- 4 user memory presets via wireless remote
- CLEAN RESIN wand for enhanced hygiene
Pros
- Significantly more affordable than the S7A
- Endless warm water with no tank delay
- 19% slimmer profile compared to the C5
- Easy DIY installation fits most elongated toilets
- Named a 2025 Wirecutter Top Pick
Cons
- No auto open/close lid
- EWATER+ cleans wand only, not the bowl
- Only a 1-year warranty
If you want the very best of what TOTO’s mid-range line has to offer — reliable, feature-packed, and approved by bathroom experts — the S5 is one of the smartest bidet purchases you can make right now.
It’s especially worth your attention if you’re upgrading from a C100, C200, or C5, as you’ll notice immediate improvements without jumping to a flagship price point.
If you’re also curious how TOTO compares to other top names in the bidet world, our guide to the best bidet brands breaks things down nicely.
Check its current price on Amazon
2. TOTO Washlet S7A Electronic Bidet Toilet Seat (SW4736AT40#01)
The TOTO Washlet S7A is TOTO’s current flagship bidet seat, stepping in as the successor to the legendary S550e with a redesigned lid, more automation, and a sleeker silhouette than ever before.
At just 4.1 inches in rear height, it’s one of the thinnest premium bidet seats on the market — and its auto open/close lid gives you a truly hands-free bathroom experience from the moment you walk in.
Features
- Auto open/close sensor lid (hands-free operation)
- Instantaneous water heating for endless warm water
- PREMIST bowl misting before each use
- EWATER+ cleans both the wand and the toilet bowl
- 5 adjustable spray settings including oscillating and pulsating
- Heated seat with 5 temperature settings
- Warm air dryer with 5 temperature settings
- Automatic air deodorizer
- Built-in nightlight
- 4 user memory presets via luxury illuminated remote
- Auto-flush compatible (kit sold separately)
- Ultra-slim 4.1″ rear profile — one of the thinnest on the market
Pros
- Fully hands-free experience with auto lid and auto-flush compatibility
- EWATER+ mists both wand AND toilet bowl for superior hygiene
- Ultra-slim design with contemporary flush lid aesthetic
- 2-year warranty — double what the S5 offers
- WASHLET+ compatible for seamless cord concealment on TOTO toilets
Cons
- Significantly more expensive than the S5
- Auto-flush requires purchasing a separate kit
- The premium price is overkill if you don’t need the auto lid
If you want the absolute best that TOTO produces in a bidet seat format — and budget is not your primary concern — the S7A delivers an experience that’s remarkably close to a fully integrated smart toilet at a fraction of the price.
It also makes a strong case for households with multiple users, since its hands-free operation removes one more point of contact in a shared bathroom.
If you’re interested in how the S7A stacks up against full combo units, check out our roundup of the best toilets with bidet for a broader look at what’s available.
Check its current price on Amazon
Head-to-Head: TOTO S5 vs S7A
Cleansing Performance
Both seats deliver identical spray options — five adjustable settings with oscillating and pulsating modes — and both use TOTO’s AIR-IN WONDER WAVE technology to infuse air into each water droplet for a gentler, more effective clean.
Where the S7A pulls ahead is in bowl hygiene.
Its EWATER+ system mists both the wand AND the inside of the toilet bowl before and after each use, while the S5’s EWATER+ is limited to wand cleaning only.
If maintaining a cleaner bowl with less manual scrubbing is a priority for you, the S7A wins this round.
Winner: S7A
Comfort and Convenience
Both seats offer a heated SoftClose seat, warm air dryer, automatic deodorizer, nightlight, and instantaneous warm water — so the day-to-day comfort experience is virtually identical.
The key differentiator is the auto open/close lid on the S7A.
When you walk up to the toilet, the lid lifts automatically; when you leave, it closes on its own.
It’s a small thing until you get used to it — and then it feels like something you can never go back from.
For seniors, people with limited mobility, or anyone who values a truly touchless experience, this feature alone may justify the price difference.
Our guide to the best bidets for seniors goes deeper on why auto lids matter for accessibility.
Winner: S7A
Design and Profile
The S5 is already a notably slim seat at 5.5 inches rear height, which is a significant improvement over the older C5 it replaces.
But the S7A is in a different league at just 4.1 inches — making it one of the slimmest bidet seats ever produced.
The contemporary lid on the S7A also sits flush with the toilet bowl, giving the whole setup a sleek, integrated look that can make even a standard toilet look like a high-end smart toilet.
If bathroom aesthetics matter to you, the S7A is the clear winner.
Winner: S7A
Value for Money
This is where the S5 fights back — and fights hard.
The S5 delivers instantaneous warm water, PREMIST, EWATER+ wand cleaning, a nightlight, four user presets, and a heated seat at a price that’s substantially lower than the S7A.
For most households, the features you’ll use on a daily basis are virtually the same between the two seats.
The S7A’s premium is primarily paying for the auto lid, bowl-level EWATER+, the slimmer profile, and the longer warranty.
If those extras matter to you, the S7A is worth every penny.
If you’re focused on getting an exceptional clean at a sensible price, the S5 gives you 90% of the S7A experience for significantly less.
You can read more about why bidets are such a strong long-term investment in our article on how much money a bidet can save you.
Winner: S5
Warranty and Long-Term Reliability
TOTO is among the most trusted names in the bidet world, and both seats reflect that reliability in everyday use.
However, the S7A comes with a 2-year limited warranty compared to the S5’s 1-year coverage.
At the S7A’s price point, that extra year of peace of mind is a meaningful perk and reflects TOTO’s confidence in this flagship product.
Winner: S7A
Verdict — Which One Should You Buy?
Both the TOTO Washlet S5 and the S7A are excellent bidet seats, but they serve very different buyers.
Here’s how to make the call:
Buy the TOTO Washlet S5 if… you want an outstanding bidet seat with endless warm water, premium TOTO quality, and a thoughtful set of features — without paying for amenities you may never use. The S5 is the smarter financial choice for most households, and being named a Wirecutter Top Pick for 2025 confirms it’s no compromise. It’s also the perfect upgrade if you’re moving on from a C5 or C200 and want the latest TOTO technology without flagship pricing.
Buy the TOTO Washlet S7A if… you want the absolute best TOTO bidet seat experience available, including a hands-free auto lid, bowl-level EWATER+ cleaning, an ultra-slim 4.1-inch profile, and a 2-year warranty. The S7A is for buyers who want to walk into their bathroom and have everything happen automatically — no touching, no fussing, just a spa-like experience every time.
FAQ
Is the TOTO Washlet C5 still available?
The TOTO Washlet C5 (SW3084#01) was officially discontinued in December 2025.
Its direct replacement is the TOTO Washlet S5 (SW3446#01), which improves on the C5 with instantaneous water heating, a slimmer profile, and updated hygiene features.
If you were originally comparing the C5 to the S7A, the S5 vs S7A comparison above reflects the same decision — just with TOTO’s current, actively available lineup.
You can also revisit the older C2 vs C5 breakdown on our TOTO C2 vs C5 comparison page for historical context on the C-Series evolution.
What is the difference between the S7 and S7A?
The TOTO Washlet S7 and S7A share the same core feature set, including instantaneous warm water, EWATER+ bowl and wand cleaning, PREMIST, a heated seat, nightlight, and five spray settings.
The only difference is that the S7A adds an automatic open and close lid, making it a fully hands-free seat.
If the auto lid isn’t important to you, the S7 offers the same performance at a slightly lower price.
Does the TOTO Washlet S5 have endless warm water?
Yes.
Unlike the older C-Series seats that used a tank-style heating system (which could run cold after extended use), the S5 uses instantaneous water heating.
This means you get continuous warm water for as long as you need it — no waiting, no cold surprises.
It’s one of the biggest improvements over the C5 and a feature that the S7A also shares.
Can the TOTO Washlet S7A auto-flush?
The S7A is auto-flush compatible, but the auto-flush kit (TOTO THU857) is sold separately and must be purchased and installed in addition to the seat itself.
Once installed, the toilet flushes automatically each time you step away — giving you a completely touchless bathroom experience from entry to exit.
Conclusion
When it comes to the TOTO Washlet S5 vs S7A, you’re really choosing between two outstanding bidet seats at different price points.
The S5 is the smart, well-rounded choice for anyone who wants TOTO’s latest technology and endless warm water without premium flagship pricing.
The S7A is for those who want everything — the auto lid, slimmer profile, bowl-level EWATER+ cleaning, and the assurance of a 2-year warranty.
If you’re still comparing options across different brands and styles, our bidet toilet seat comparison chart is a great next stop.
And if you’re curious about whether the investment makes long-term financial sense, our breakdown on whether bidets save you money may surprise you.
Whichever seat you choose, you’re making an upgrade your bathroom — and your daily routine — will thank you for.
